Those have nothing special. Exposure is good for sure, clouds are well rendered, but there is no real subject. Maybe 20 minutes later, the same composition would have been better (more orange tones). The trap with dawn and dusk is (to me) wanting to show ONLY the colors/clouds/sky. It's something difficult, and often, it's better to use those colors in a composition to "help" or "beautifulize" another subject.
I took pictures of the sky for 1/2 hour, there was never any orange or yellow and the clouds were moving very fast. We had a storm move through, so there was not a spectacular sunsetlast night...Thanks for the comments and suggestions....I'll try them next time!